<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="../day06/common.css">
    <style>
        div {
            width: 200px;
            height: 50px;
            background-color: blueviolet;
            margin-bottom: 1em;
        }
        
        .box1,
        .box2,
        .box3 {
            float: left;
        }
    </style>
</head>

<body>
    <div class="box1"></div>
    <div class="box2"></div>
    <div class="box3"></div>

    <p style="background-color: red;">123</p>
</body>

</html>